good place to start is the sea peoples -wikipeadia has quite alot. then th em fenecians, then weve your own.
however i would like to say that as far as i can see the situation in the archipelagos was the usual one- following a thorough ethnic cleanse,ibiza was set up as almost sivilised,menorca for ritual (black) magic and poor mallorca ended up as a sort of breeding ground for slaves
those walls were as much to keep the people in as to protect them from other slave traders.in this theory the towers are fairly dark temples,and guard towers and the island a vast prison camp.
to be realistic about the rulers-
they are traders in weapons,drugs(all those amphoras)slaves for a wide variety of clients-metals in fact .wherever there was a racket there they were.exploiting it,no?the trade in flesh was as lucrative as any at the time,and they set about exploiting it
mining farming,empire building and war all demanded enormous quantitys of flesh-and of corse the sex industry and "domestic help"

we could debate. the nature of the cult,what sort of blood magick was (and is,alas) practiced therebut this isnt the place -i merely wanted to
point out the obvious which is rather swept under the carpet

also if you were to smelt metal in those daysyou would probally bulid a furnace a lot like a talayot-and to roast ore a kiln like a navetiform,and(it keeps stretching)even see a taula in its curve as 2 part mold..the analogy works-the undercavewater as molten metal

theres more and as many theories as theorists -the islands are so very densly covered in remains,theres something for everyone.

i would like to post instructions to reach some of the sites -directions to reach,photos beyond me at present

At son fornes the circle is a threshing floor by the way called "era" there are lots around and im surprised his lodship didnt see others in his itinery

i have isee 5 minutes left in this public libry- i will send as is rather than as a good stalkerNot edit .Xdave